# Question about momentum unit and its conversion to energy.

Hello.

I'm reading some accelerator physics paper showing the momentum unit for the accelerated particles as MeV/c.

I'm not interested in the momentum but energy thus I really want to convert this to energy.

How it is done? Simply multiplying c? if so, there must be some reason for justify the action.

Dale
Mentor
2020 Award
Momentum, energy, and mass are related by ##m^2 c^2=E^2/c^2-p^2##

jtbell
Mentor
Or, the way I like to remember it: ##E^2 = (pc)^2 + (mc^2)^2##.

E, pc and mc2 all have units of energy (MeV or joules or whatever)

Oh thanks people!

Thus..since momentum in the paper is, for example, 0.79 MeV/c so pc should be simply the momentum multiplied by c, 0.79 MeV right?

jtbell
Mentor
Right.